Blow-off valve.



No. 721,453. PATENTED FEB-14,1903.

- E, H. LUNKEN.

BLOW-OFF VALVE, f APPLICATION FILED NOV. 2, 1991.

no MODEL. 2 SHEETS-PERMIT 1.

' Witnesses.

I fl PATENTED FEB. 2-4, 19703. V E. H. LUNKER.

BLOW-OFF VALVE. APPLICATION FILED NOV. 2, 1901.

2 SHEETS-SHEET 2.

N0 MODEL.

UNITED STATES PATENT OFFICE.

EDMUND H. LUNKEN OF DENVER, COLORADO, ASSIGNOR TO THE LUNKEN- HEIMER COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

BLOW-O l-fF-VALVE;

SPECIFICATION forming part of Letters Patent No. 721,453, dated February 24, 1903.

I Application filed November 2, 1901. Serial No. 80.869. (No model.)

,To on whom, it may concern:

Be it known that I, EDMUND H. LUNKEN, a citizen of the United States, residing at Denver, in the county of Arapahoe, in the State 5 of Colorado, have invented certain new and useful Improvements in Blow-OE Valves, E which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.-

My invention relates to that class of valves which are used in connection withboilers or I their mud-drums for cleansing out the same and carrying off all collected mud, sediment,

I scale, and other foreign matter which accumulates therein. Heretofore in valves of this character there has been no provision made for renewing the cut-off for the valve-disk, and as it is well known thatvalves of this character wearout rapidly, owing to the gritty nature of the discharged accumulations which cut and wear away both the cut-off of the valve-disk and the valve-seat, the value of my invention will be readily apparent when it is understood that I apply both arenewable cut-off and a renewable valve-seat which can be readily applied to the valvecasing whenever the former ones become worn, thereby prolonging the life of the valve Very greatly.

The novelty of my invention will be hereinafter set forth, and more specifically pointed out in the claims. 7 1

In the accompanying drawings, Figure 1, Sheet 1, is a central sectional view inelevation of a blow-off valve embodying my invention and with the valve-disk closed. Fig. 2, Sheet 2, is a corresponding view of the lower part of the valve-casing with .the valve-disk partially opened. Fig. 3, Sheet 2, is an enlarged central sectional elevation of the renewable cut-0E andseat under my preferred form of construction. Fig.4, Sheet 2, is 'a detail sectional view illustrating a modified form of construction of the renewable cut-off and seat.

The same letters of reference are used to indicate identical parts in all the figures.

A represents the valve-casing of the usual or any suitable construction, having on one side a neck B, adapted for connection with the blow-off pipe, either from a mud-drum or from the boiler direct, and also having a neck 0, adapted for connection with a dischargepipe. The mainshell or casing A has a "chamber D, into which an induction-port B throughthe" neck B enters and out from which an eduction-port C leads through the neck 0. i The ports B and C are at right an-' gles to each other, and into the latter, as well as into the chamber D, is fitted a renewable or removable guide-cylinder and cut-off E. (See Fig. 3.) Thisguide-cage has openings F through it in line with 'theinductionport B, and the diameter of the chamber D is ea larged around saidopenings to permit free ingress of the discharged contents of the muddrum or boiler into the cage all around its periphery, as seenin. Fig. 1. The lower edges of the openings F in the guide-cylinder, as at a, which are on a level with the lower side of the induction-port B, form a sharp cut-off for the valve-disk G, which is moved up and down and fits snugly cage E, like a piston, by means of a stem H, passing through a stuffing-box I in the arched cap of the bonnet J, which is secured ,upon the valvecasing A in the usual or any 'suitable'manner and Whose upper threaded end passes through a threaded bore in the top of the arch and is controlled by a hand-wheel K. That part of the renewable cylinder which is fitted snugly in a recess in the eduction-port C has a circumferential chamber b, Fig. 1, around it, intowhich opens a fluid-pressure pipe or passage 0, leading directly from the water-space or the live-steam space of the boiler and opening through the cut-off wall by means of a circumferential slot d, Fig. 3, which communicates with a series of pockets 6 upon the inner side of the cut-off just above the valve-seat L. The valve-seat L is preferably renewable and has an outwardly-extended shoulder f engaging with an inwardlyextended shoulder g of the cut-off cylinder E, into which it fits and whose lower end is eX- teriorly threaded, as at h, to be screwed'into the eduotion-port C to form a convenient means of locking the cut-off and guide-cylinas a convenient means of thus applying and removing the parts lugs 2' are formed on the inner side of the valve-seat, which can be engaged by a spanner-wrench when the valvedisk and bonnet .T are removed, as will be readily understood.

While I prefer the use of the pressure-passage c, which cleanses the valve-seat effectually as soon as the valve-disk has passed below the edge of-the cut-off in a manner known to the art, yet my invention is not to be limited to the use of such pressure passage,which might be dispensed with. Again, while I prefer to construct the cut-01f in the form of a cylinder to guide the valve-disk, the cylinder feature of the cut-0E might be dispensed with and the valve-disk be guided in any other suitable manner. Again, while I prefer to unite the cut-off to the valve-chamber by means of the valve-seat, both the cut-off and the valve-seat might be separate, as seen in Fig. 4, and each be independently screwed in the eduction-port, so as to make both inde pendently removable. M is simply an aperture in the valve-casing A opposite the induction-port B, normally closed by a screwplug N to enable the induction-port to be cleared in case of choking by any suitable instrument. Again, while I have shown the valve-seat and cut-off as separate pieces, it is to be understood that it would be no departure from my invention to construct them in one piece.

Having thus fully described my invention, I claim- 1. In a blow-off valve, a casing having an induction-port, an eduction-port, a valve-disk with means for operating the same to open and close the eduction port, a renewable guide-cylinder for the valve-disk with an opening therethrough from the inductionport and having its lower end formed into a cut-off for the valve-disk, and a renewable valve-seat for the valve-disk engaging with said guide-cylinder and with the valve-casing to hold said guide-cylinder in place, substantially as described.

2. In a blow-off valve, a casing having an induction-port, an eduction-port, a valve-disk with means for operating the same to open and close the eduction port, a renewable guide-cylinder for the valve-disk with openings therethrough from the induction-port and having its lower end formed into a cutoff for the valve-disk, a renewable valve-seat for the valve-disk engaging with said guidecylinder and with the valve-casing to hold said guide-cylinder in place, and a fluid-pressure passage opening into said casing with port com munication through said cylinder between the valve-seat and renewable cut-off, substantially as described.

EDMUND I-I. LUNKEN.

Witnesses:

EDWARD PEOK, GUS. G. HAMPSON. 

